Design and Testing of Seed Push Wheel for High-Speed Precision Seed Metering Device for Corn With Internal Seed Filling and Positive Pressure Airflow

Aiming at the problem of high cob loss in non-opposed row harvesting of 4YZ-6 fresh corn harvester, a front-end part adapted to the grain splitter of this model was designed. The structure of the front-end part was elaborated, the sliding conditions of the stalks under the action of the grain splitter were studied, the forces between the stalks and the front-end part were theoretically analyzed, and the operating effect of the front-end part was verified through field tests. The tests show that the expected operating effect is optimal when the inclination of the grain separator is 27.7°, the clamping angle of the grain splitter is 31°, the stubble height is 270 mm, and the front-end guards half width is 3.8 mm. The verification test for this parameter combination yielded a breakage rate of 8.71% and a loss rate of 9.47%, which were basically consistent with the expected values. The design of this front-end component of the grain splitter provides an effective means to reduce the loss of ears in the harvesting process of fresh corn.

Design and Testing of 4yz-6 Fresh Corn Harvester Grain Splitting Front End Component

LI,

YE,

NIE

et al. 2024

Vibration Parameter Calibration and Test of Tiger Nut Based on Discrete Element Method

MA,

HE,

ZHU

et al. 2024

In this study, the parameters of tiger nut were calibrated based on discrete element method, and significant influencing factors and optimal levels were selected by Plackett-Burman test, steepest climb test and center compound test, and verified by electromagnetic vibration hopper bench test. The results show that the relative error between the simulated resting angle and the actual resting angle is only 0.381%. The fitting degree of the model is 96.32% and 94.57% respectively, which can provide theoretical basis for the study of the parameters and discrete element simulation of tiger nut.

Design and Experiment of Annular Air-Blowing Assisted Seed Guiding Device for Corn No-Till Seeder

ZHOU,

ZHANG,

LIU

et al. 2024

In the process of seed introduction, there is a problem of seed falling disorderly due to the collision between the seed and tube wall, which seriously affects the uniformity of seed spacing in the field. To solve this problem, this paper designed a kind of annular air-blowing auxiliary seed guide device. After a series of simulation experiments, theoretical research, and high-speed camera bench experiments, the optimal parameter selected combination of the critical structure of the seed guide device. The experimental results showed that when the annular air-blowing assisted seed guide tube was used, the positive air pressure was 2 KPa, the airway angle was 150°, the airway outlet width was 12 mm, and the distribution pore diameter was 4 mm. When the forward speed was 6km/h (the rotation speed of the seed metering disc was 25.30 rpm), the seed sowing effect was the best in the seed guide device; the qualified rate was 88.36%, and the coefficient of variation was 12%. This study provides a reference for improving seed spacing uniformity and can be used to optimize seed guide tubes.